Traditionally, the information was obtained manually. That involved sending workers out into the area at night to count the number of lights and note down whether they were in working order. An alternative is to drive around in a vehicle fitted with the sort of 360-degree video camera computer map makers use. We estimate that we can do the job using cutting-edge techniques in a fraction of the time – just 10% -- taken for a manual census. It is safer because no human is in the field working at nighttime rates. That all adds up to lower costs for the customer – we estimate a saving of about 40% over a manual census with better results. Moreover, the technique shows districts where dense populations coincide with dim lighting, offering an opportunity for us to help with improvements. That might call for greater density of lighting poles, and our analysis will help decide where to put them, or simply for brighter, more efficient lighting.